how to load regular order in custom email template

email type is “appointment_confirmed” from bookingwp is registred and the villatheme email template theme is used, but the context with wc_order is not loaded.

I found a undocumented hook, but i am not able to load the order from it

function termin_load_template( $args ) {
$appointment = wc_appointments_maybe_appointment_object( $appointment );
$appointment = $appointment ? $appointment : get_wc_appointment( 0 );
$wc_order = $appointment->get_order();

if($wc_order) {
$args[’email’] = $wc_order;
}
}
add_action( ‘viwec_email_template’, ‘termin_load_template’, 9 );

bookingwp plugin is very popular and some documentation to use it with the email template pro would be very well come